'Where are the build and start commands configured by amplify init used?

On amplify init or on the amplify pull of a new project, I'm asked to specify

? Build Command: 
? Start Command: 

What is the significance of these commands and where are they used? Are they relevant to a React Native mobile app workflow — e.g., an Expo/EAS workflow — and if so should I set them to match the command I generally use:

? Build Command: eas build --profile development --platform ios --local
? Start Command: expo start --dev-client


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